Topic 30: amphibians

Question 1

Amphibia

Answer 1

includes frogs, salamanders, caecilians

Question 2

Amphibian charachteristics

Answer 2

thin, water and gas permeable moist skin, contain mucous glands that keep the skin moist, the skin is a second respiratory substance to complete gas exchange, ectothermic (low metabolic rate due to heat exchange with environment), use a buccal pumo to ventilate lungs, must reproduce in water, external fertilization, eggs lack shells and extraembryonic membranes, have external eardrum, gills only in larval stages, three chambered heart

Question 3

Salamanders

Answer 3

amphibians with tails in adult stage (and larvae stage), lay eggs in water with aquatic larvae, have external gills, and some are aquatic while some are terrestrial, some walk and not jump

Question 4

Frogs

Answer 4

lose tails at maturity, hind legs modefied for jumping, well-developed ears

Question 5

Toads

Answer 5

frogs with leathery skin

Question 6

Ceacilians

Answer 6

legless amphibians, resemble earthworms and snakes, blind, borrowers as they live in a network of tunnels, use internal fertilization